Samuel d



(No Model.)

s. 1). MQTT.

INGANDESUING' ELEGTRIG LAMP; No. 283,270. Patented Aug. 14, 1883.

WITNESSES: 7; INVENTOR: flaw ATTORNEYS.

n. versus. PhaloLikMgnpMr. Wzvhmnon. u. c

UNITED STATES PA ENT OFFICE.

SAMUEL D. MOTT, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO THE EDISON ELECTRIC LIGIIT COMPANY, OF NEXV YORK, N. Y.

INCANDESCING ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 283,270, dated August 14, 1883.

Application filed November 29, 1881. Renewed August 14. 1882. (N0 model.)

To aZZ whom it may concern.- I

Be it known that I, SAMUEL D. Morr, of Menlo Park,'in the county of Middlesex and State of New Jersey, have invented a certain new and useful Improvement in Incandescent Electric Lamps, (Case 13,) of which the following is a specification.

Heretofore incandescent electriclamps have had molded or otherwise formed on the lower part of their glass-supporting necks or stems,

a collar or base of insulating material, to the exterior of which two terminals are attached. Such terminals are arranged to correspond with similar terminals on the interior of a socket of insulating material.

The object of my invention is to dispense with the insulating collar or base, instead of attaching the terminals directly to the glass, producing a collar simpler and easier of construction, smaller and neater in appearance, and more reliable and durable in use than those hitherto made. In accomplishing these ends I use for the lamp-terminals a screwthreaded metal ring and a metal plate or button. The ring which forms the upper terminal is placed around the glass neck, which is softened by heat and then blown out into the ring, filling the latter, so that it is held closely to the glass. To keep it'from turning around on the glass it is provided with a depression, forming an internal vertical rib, which holds it in place on the glass, and also furnishes a convenient place for soldering one of the lead ing-in wires, which is bent out and attached to the ring. The upper part of the-ring is enlarged, so as to form a shoulder to support the lamp when placed in its socket. The lower terminal is a button or plate, having a projection, which, when the plate is placed across the lower end of the stem, extends up within the stem, and has the other leading-in wire attached to it. The glass is pinched down upon the projection, so that the terminal is held in place.

A convenient socket, in which the lamp may be placed, consists of a metal .ring or sleeve, a portion of whoseinterior has a screw-thread corresponding to that of the base. The metal sleeve terminates in a block of insulating material containing aterminal corresponding to the lower terminal of the lampbase. To this terminal and tothe sleeve are attached the respective wires of the multiple-arc circuit in which the lamp is placed.

In the annexed drawings, Figurel is aview 'of a lamp with the ring-terminal placed in po- 5 5 sition; Fig. 2, a sectional view of the lower part of the lamp after the glass is blown out into the ring and the other terminal attached; Fig. 3, an elevation of the same, and 4a view of the completed lamp set in its socket.

.Similar letters referto corresponding parts in all these figures.

A represents the glass inclosing-globe of an incandescing electric lamp, and 1- its interior glass tube or stem, supporting the carbon (3.

D is the upper or screw-threaded ring-ter minal, and (l the lower or plate-terminal.

InFig. 1 thelamp has not yet been exhausted, and the ring Dis simply placed over the. neck of the lamp,without being secured there. The glass of the tube B is softened and blown. out, so as to completely fill the screw-threaded portion of the ring D. The lower portion of the tube B is then broken off and the terminal d placed on the end of the remaining portion. The wire 2 is bent up and soldered to the ring D; or this wire may, before the glass is blown out into the ring, be placed between the .glass and the ring, and thus held,

when the glass is caused to fill the entire ring and the wire 1 attached, asshown, to the terminal d. The lamp is now in the form shown in Figs. 2 and 3, the glass being softened and pinched down at 1) upon the upward projection of the terminal (I, so as to hold the terminal in 8 5 place. (See Fig. 3.)

In Fig. 3, a is a vertical depression, which forms a vertical rib on the inside of the ring D, employed to keep the ring from turning around on the glass. In this depression is 0 soldered the end of the wire 2.

In Fig. 4 is shown a form of socket adapted to receive this lamp. E is a block of wood or other insulating substance. From it extends upwardly a metal ring or sleeve, F, adapted to receive the ring D, and having a screw-thread correspondingto that of the ring. A metal ter-" minal, c, is placed so as to contact with thelampterminal (I. From the ring F and terminal 0 wires run to the interior of a fixture 'which supports the socket and lamp.

\Vhat I claim is-- 1. The combination, with the glass neck or stem of an incandescing electric lamp, of a screw-threaded metal .collar or ring secured directly upon the glass of said neck or stem, one of the leading-in wires of the lamp being attached to said collar or ring, substantially as set forth.

2. The combination, with an incandcscing eleetriclamp, of a screw-threaded metal collar or ring encircling the glass neck or stem of said lamp, and provided with an internal rib, substantially as and for the purpose set forth.

3. The combination, with an incandescing electric lamp, of a plate or button adapted to form one of the terminals of the lamp, and secured directly and permanently to the end of the glass neck and to one I. substantially as set forth.

eading-in Wire,

4. The combination, with the; glass neck or stem of an incandescing electric lamp, of a screw-threaded metal collar or ring secured directly upon the glass of said neck or stem, and a plate or button secured directly to the end of said neck or stem, the leading-in wires ofthe lamp being attached, respectively, to said collar and said plate oributton, substantially as set forth.

This specification signed and witnessed this 19th day of November, 1881.

SAMUEL D. MOTT.

VVitn ess es H. W. SEELY, RICHD. N. DYnR. 

